You should begin to feel an increase in mental energy and focus within twenty minutes. For this reason, do not take it late in the day as it may delay falling asleep.

Are there any side effects to taking acetyl-L-carnitine?

Long term, there are no side effects, only benefits. This is because acetyl-L-carnitine protects and helps to regenerate the brain. Acetyl- L-carnitine is not a stimulant. It is a nutrient which naturally increases the energy of the brain.

Are there nutrients that help acetyl-L-carnitine work more effectively?
Phosphatidyl serine, B vitamins, lipoic acid, phosphatidyl choline and EPA/DHA (fish oils) all increase the effectiveness of acetyl- L-carnitine.